Toshiba CF19G32

SuntharAbout 5 min

Toshiba CF19G32 CRT RGB mod

The Toshiba CF19G32 is a 19" consumer CRT known for its high-quality picture tube and suitability for RGB modification.

Toshiba CF19G32 RGB image

View full CRT details and more mod examples →open in new window

Captured from RGB modded NES

Contributors

Thank you to everyone who contributed to this guide:

Suntharopen in new window — author

CRT safety

Caution

You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.

READ THIS BEFORE CONTINUING

Plan of attack

READ THIS TO PREPARE

Manuals and Datasheets

Specs

Manufactured: Thailand (2001)
Format: NTSC
Tube: Toshiba A48KZL70X
Jungle Chip: Toshiba TA1223AN
OSD Chip: Toshiba TMP87CM34BN
Screen Size: 13"
Weight: 22 lbs
Inputs: Composite, RF

Schematics

Get hold of the schematics for your TV. Understand where the RGB and Fast Blanking signals go from OSD to the Jungle (Chroma) chip.

Jungle Chip ^

OSD Chip ^

RGB mux diagram

Prepare the mux diagram. If you are building your own circuit, this diagram should help.

Toshiba CF19G32 RGB MUX diagram

Performing the mod

STEP 1: Remove the following components

Remove the three 1.2 kΩ, RGB resistors to ground

RR90
RR91
RR92

STEP 2: Remove jumpers and install diodes

Remove jumpers 035, 036 and 037. Install diodes (1N4148) in those locations instead. Pay attention to the direction of the diodes. This will prevent the current from going into the OSD, creating a reflection in signal, that causes interference.

STEP 3: Connect RGBs

Points where the R, G, B and Blank (brown) wires should be connected. Ignore the colors of the wires. I used a shielded wire for this mod. R, G, B wires were not individually shielded. However, there were absolutely no intereference noticed.

STEP 4: Hook up blanking and Audio

Routed the wires from the top of the board to the bottom side. Some holes were covered with solder. Removed it to expose the holes and routed the wires through them.

Purple and black wires were routed to ground. Yellow wire to composite input pin. White wire to audio left. Gray wire to audio right.

STEP 5: Build your mux circuit

This mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the mux calculatoropen in new window to play with your own values.

On Toshiba CRT Chassis	CF19G32
CRT RGB inline resistor	4.7kΩ
CRT RGB ground resistors removed	1.2kΩ
0.1μF caps replaced	Yes
Add diodes on chassis RGB lines?	Yes
Add blanking diode on chassis	Yes
Replace blanking resistor on chassis	No

RGB mux board	CF19G32
Mux board RGB termination (R1, R2, R3)	180Ω
Mux board RGB inline resistors (R4, R5, R6)	1kΩ
Mux board Audio LR (R7, R8)	1kΩ
Mux board blanking diode (R9)	1N4148
Mux board blanking ground resistor (R10)	open
Mux board blanking resistor (R11)	4.7kΩ

Compatible mux boards:

Buy your RGB mux board kit

I had to use a RGB tuner gadget I made to find the right balance for RGB termination. It was found using a 150Ω to 180Ω resistor gave the best vibrancy of colors.